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정상화(S. H. Jeong),김광호(G. H. Kim),신상문(S. M. Shin),이상희(S. H. Lee),김주환(J. H. Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Recently, as the infocomindustry is developed, the semiconductor industry as well as the optical industry such as the optical communication and the optical instrument is developed rapidly. The transmission, storage and processing of information has been reaching an limit because amounts of information increase rapidly. The more quickly the optical communication is developed, the more sharply the demand of optical elements increase. The transport and inspection process is time consuming and the error rate is high, because this process are not automated in case of an optical lens. In this paper, the pick-up system that can hold optical elements and be transferred by the ultrasonic transport system is developed. The inspection system that distinguishes between the existence and the nonexistence of a defect is connected easily to pick-up system. The pick-up system separates the optical glass lens by results of the inspection. The automation program is developed by visual c++ programming.
정상화(S. H. Jeong),김현욱(H. U. Kim),최석봉(S. B. Choi),박준호(J. H. Park),김광호(G. H. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In recent years, as the robot technology is developed, the researches on the artificial muscle actuator that enable robot to move dexterously like biological organ become active. The widely used materials for artificial muscle are the shape memory alloy and the electro-active polymer. These actuators have the higher energy density than the electro-mechanical actuator such as motor. However, there are some drawbacks for actuator. SMA has the hysterical dynamic characteristics. In this paper, the simulation of anthropomophic robotic hand is performed using ADAMS and the segmented binary control for reducing the hysteresis of SMA is proposed. SMA is controlled by thermo-electric module. The relations between the force and the hysteresis are developed to verify the validity of the suggested method.
비직교 다중접속을 위한 딥러닝 기반의 다차원 변조 신호점 설계
서한창(Hanchang Seo),한민식(Minsig Han),강충구(Chung G. Kang) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.11
본 논문은 autoencoder 를 활용하여 최적화된 resource 맵핑 과 constellation 맵핑을 수행하는 새로운 code domain-NOMA 방식을 제안한다. 지금까지 고려되지 않은 새로운 구조의 autoencoder를 제안하여 minimum Euclidean 거리를 최대화하는 최적화된 다차원 심볼을 생성하도록 종단간학습(end-to-end learning)을 수행하고, 다중 사용자의 다차원 신호점에 대해서 복호화를 수행한다. 제안한 방식에 의해 10-3 의 비트오류 성능이 기존 SCMA 방식보다 4.5dB 이상 D-SCMA [2]보다 2.7dB 향상되는 것을 시뮬레이션을 통해 확인하였다.